Every parent knowing a Todd wi toddler with a temper is terrible. The supernanny has a new book and juju caught up with her and a family in need. ? Reporter: More power than than a toddler's tantrum. Able to withstand a child's piercing scream, it's supernanny. Time-out because you did not listen. Reporter: The modern-day Mary poppins starred in her own hit show for seven seasons and with 25 years of child care experience her just released sixth book is simply Jo frost, "Toddler rules." Who rules the house? Patrick. Reporter: We asked Jo to use her superpowers on Patrick, all of 3. What do you want Joe to work on? Some discipline issues. You know, we tell him something, he doesn't want to do it, how to get him to do it when he's supposed to, either eat or go to bed. Reporter: He was born with a heart defect and spent months in the hospital with two open heart surgeries. They say it's hard to forget that trauma when it's time to dismain their toddler. Hi, Patrick. Reporter: After getting to know Patrick Jo works her magic. Her first piece of tough love, give him choices but stick to them. You need to tell me, sausage, pasta, which one. If he pushes it away, push it aside and give him nothing. You'll wait until that next meal time because then he'll learn. Reporter: Next, bedtime. With at that time pick still sleeping in his parents' bed, no alone time. Jo's fix, the sleep separation technique. You just sit adjacent to the bed. If he calls you, okay, you won't respond. If he gets out of his bed, then you just place him back in but you don't talk because what you're teaching him is night time. You do it correctly, that will take you no longer than five days. Reporter: Lastly, discipline. Jo recommends creating and closely keeping a daily routine to help Patrick to learn stability. So recognize that his heart condition has not hindered him to understand his brain to understand to do things. The biggest issue for Patrick, by letting him rule the roost, they were not doing him any favors. By treating him that way they were not allowing him to fly. Reporter: For "Good morning America," juju Chang, ABC news, New York.

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